Finding the Fourth Proportional to 1,354.59, 1,868.77 and 911.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.59 : 1,868.77 = 911.72 : x
2. Step 2: Convert to fraction form
   1,354.59/1,868.77 = 911.72/x
3. Step 3: Cross multiply
   1,354.59x = 1,868.77 × 911.72
4. Step 4: Simplify right side
   1,354.59x = 1,703,794.98
5. Step 5: Solve for x
   x = 1,703,794.98/1,354.59
6. Step 6: Final answer
   x = 1,257.79